Q.

The complex protein distributed at regular intervals on the thin myofilament is

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a

myosin

b

actin

c

tropomyosin

d

troponin

answer is C.

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Detailed Solution

Troponin is a complex protein distributed at regular intervals on the tropomyosin. It has three subunits (TnC, TnT and TnI). During muscle contraction, active sites on actin filaments are exposed when Ca2+ ions bind to TnC.

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